Great cars definitely add fun and versatility to this great collection. It's fun to make toy cars and trains. However, as you might expect, Magnatiles tend to fall off easily when traveling in small vehicles. And if you're thinking of using it as a train, the magnets in the two carriages obviously only stick around the smoothest of turns. As long as you wait for the limitations of the magnets, they will not disappoint you. These are great toys, but they're not as versatile as Lego or Duplos.